The Ottoman army included janissaries (paid warriors) and sipahis (vassal knights).
Public schools in villages played an important role in education.
The Crow are Native Americans who inhabited the Yellowstone River valley.
Freshwater fish used as food in many parts of the world.
Building 3D shapes into a given cube mesh with the help of several views.
During the evolution of vertebrates the relative development of brain areas has changed.
This animation demonstrates the mechanism and operation of record players.
Ancient Egypt was called the ‘gift of the Nile’, since the river played an important role in the rise of Egyptian civilization.
The changing bicycle, at first mocked as a toy, is a true mirror of the technical development over the last three centuries.
The legendary M61 class locomotives of the Hungarian State Railways were manufactured by Nohab.
Certain mollusks produce pearls in order to protect themselves from parasites or debris. Pearls are used for making jewelry.
Solid, white substance, a constituent of vegetable oils and animal fats.
The city with advanced culture was the first settlement in history to have a citadel.
Atmospherical nitrogen is bound by bacteria and used by living organisms in the form of various compounds.
Ancient Roman conquerors had effective siege engines developed for attacking fortifications.
As the Roman Empire expanded, military camps were established on the newly conquered territories.
The animation presents the main air, water and land routes and transport hubs.
The bicycling manual contains rules concerning the safety equipment of bicycles.
The invention of the ballpoint pen made writing a lot easier.
Oxygen carrier protein in our red blood cells.